From: Eero Nurkkala <ext-eero.nurkkala@xxxxxxxxx> The device no longer hits retention if element DMA mode is taken for at least the duration of the serial console timeout. Force element DMA mode to shut down through smartidle. Signed-off-by: Eero Nurkkala <ext-eero.nurkkala@xxxxxxxxx> Acked-by: Eduardo Valentin <eduardo.valentin@xxxxxxxxx> --- arch/arm/plat-omap/mcbsp.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c index c6df47d..a4af1fa 100644 --- a/arch/arm/plat-omap/mcbsp.c +++ b/arch/arm/plat-omap/mcbsp.c @@ -343,6 +343,15 @@ static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp) syscon = OMAP_MCBSP_READ(mcbsp->io_base, SYSCON); syscon &= ~(ENAWAKEUP | SIDLEMODE(0x03) | CLOCKACTIVITY(0x03)); + /* + * HW bug workaround - If no_idle mode is taken, we need to + * go to smart_idle before going to always_idle, or the + * device will not hit retention anymore. + */ + syscon |= SIDLEMODE(0x02); + OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon); + + syscon &= ~(SIDLEMODE(0x03)); OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon); OMAP_MCBSP_WRITE(mcbsp->io_base, WAKEUPEN, 0); -- 1.6.2.GIT -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
